CN114088239B - Manufacturing and packaging method of sensor assembly for fluid multi-parameter measurement - Google Patents
Manufacturing and packaging method of sensor assembly for fluid multi-parameter measurement Download PDFInfo
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- CN114088239B CN114088239B CN202010762419.6A CN202010762419A CN114088239B CN 114088239 B CN114088239 B CN 114088239B CN 202010762419 A CN202010762419 A CN 202010762419A CN 114088239 B CN114088239 B CN 114088239B
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/661—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters using light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- Optical Transform (AREA)
Abstract
The invention relates to a manufacturing and packaging method of a sensor assembly for fluid multiparameter measurement, which comprises the following steps: s1: preparing and preassembling materials; s2: split charging of the compound sensor; s3: split charging of pipe joints; s4: assembling; according to the invention, a brand-new sensor assembly structure is analyzed and researched, a reasonable and ingenious manufacturing and packaging method is adopted, the sensor assembly is rapidly assembled and formed, the pressure, the temperature, the flow and the pressure pulsation in a hydraulic pipeline can be detected at the same time, the manufacturing and packaging method of the whole sensor assembly is high in feasibility, the manufacturing and packaging success rate is high, the product performance is stable and reliable, the manufacturing and packaging cost of the product is controlled in a reasonable range, and all parts of the sensor assembly are skillfully manufactured and assembled.
Description
Technical Field
The invention relates to a manufacturing and packaging method of a sensor assembly for fluid multi-parameter measurement.
Background
In the prior art for diagnosing a malfunction of a hydraulic system, only one of the temperature, pressure, and flow rate of the hydraulic system is generally detected, and thus it is difficult to diagnose the malfunction of the hydraulic system.
For example, in hydraulic system troubleshooting, an abnormal behavior of an actuator (e.g., running gear deviation; hydraulic drive hoist work efficiency decreases; machine tool head does not move; etc.) often occurs, and in such hydraulic fault diagnosis, the existing method is to perform pressure measurement on a pressure measurement point, but it is often difficult to determine whether the flow rate is uniform or not only by pressure measurement, locally due to internal leakage or throttling (usually accompanied by local temperature rise), etc., and such faults are often found. Particularly, the machine tool is small in space, a hydraulic pipeline is thin, a conventional pressure sensor is more difficult to access, a certain plug or pipe fitting interface is usually opened for judgment, auxiliary judgment is carried out by checking whether oil is available or not, and an old master with abundant working experience is often enabled to judge accurately.
And if the hydraulic walking machine is used, the load sensitive system is normal before a certain pressure, abnormal sound exists when the pressure is exceeded, a flowmeter exists at the oil outlet of the pump when the pressure is exceeded, the flow is unchanged, the pressure is stable, and the pressure is still deviated. For such faults, means such as disassembly and replacement are generally adopted to carry out one-to-one elimination of suspected fault points. For example, the walking valve, the foot valve, the pilot valve and the auxiliary valve are removed, whether the walking valve core is deviated or the flow distribution block oil outlet pipe is changed, and whether the direction is deviated or not is changed; then a diverter valve, etc.
Thus, the hydraulic fault is usually removed within several days, and the workload is large, which also causes unavoidable leakage of hydraulic oil, environmental pollution and pollution of oil in a hydraulic system.
Therefore, in order to ensure the normal operation of the hydraulic system, the operation parameters of the hydraulic system are usually required to be monitored in real time so as to know the operation condition of the hydraulic system in time, and particularly, early warning is timely carried out before the hydraulic system fails; or when the hydraulic system fails, providing analysis parameters for timely diagnosing the type and the reason of the failure. At present, the diagnosis needs to rely on the operating parameters such as temperature, pressure, flow and the like in the hydraulic system to accurately judge the type or cause of the fault.
The method is characterized in that the method is used for judging the faults of the human body through the information acquisition of the pressure, the speed, the pulsation frequency and the body temperature of the pulse, and the difficult and complicated diseases of the human body can be judged through the verification and the comparison. Therefore, similar to the effective method for diagnosing diseases in traditional Chinese medicine, the development of a sensor joint and a measurement and control instrument integrating pressure, temperature, flow and pressure pulsation is necessary for fault diagnosis of a hydraulic system.
In a hydraulic system, the conventional hydraulic parameter detecting head is large in size and is difficult to meet engineering requirements, and the fiber grating sensor is widely applied to the fields of fiber communication and sensing because of small size, so that the fiber grating sensor is gradually developed in the hydraulic field.
The common fiber grating has poor tensile and bending resistance under the condition of exposure, the fiber grating needs to be packaged necessarily, and the fiber grating needs to be separated and packaged necessarily due to the cross influence of temperature and strain, so that the fiber grating is packaged and protected quite necessarily.
Because the flow velocity of the liquid in the hydraulic transmission pipeline and the pressure difference between the flowing regions form a corresponding relation, and because the flow rate in the pipeline can be formed by multiplying the flow velocity by the cross-sectional area of the pipeline, the flow rate in the pipeline can be obtained by checking the pressure difference. Thus, the temperature, pressure and flow parameters of the detected hydraulic system can be reduced to the detection of two parameters, namely temperature and pressure (or pressure difference). In order to separate the crossing signals of the fiber grating subjected to temperature and pressure strain, so that the temperature or pressure can be conveniently extracted from the acquired composite signals, in recent years, a plurality of sensors based on single-parameter measurement of the temperature, the pressure and the flow of the fiber grating are proposed. Among them, a fiber grating temperature probe (chinese patent application 201010279045.9) has been proposed, which includes a medium packaging tube, a fiber grating and a packaging device, the packaging device transmits the external temperature to the fiber grating, and the temperature is measured by using the temperature sensitive characteristic of the fiber grating. The dielectric packaging cylinder of the device is made of insulating plastic, the fiber bragg grating is suspended, the heat transfer is slower, and the response speed of the sensor is slower.
An optical fiber grating pressure sensor for pipeline detection (chinese patent application 201510415610.2) has been proposed, in which a pressure change is converted into a diaphragm center deflection change by an elastic diaphragm, and the diaphragm center deflection is measured by an optical fiber grating, so as to measure the pipeline pressure. The pressure sensor with the structure has the advantages of large volume, complex structure, more force transmission mechanisms and easy error accumulation.
There has also been proposed a target type fiber bragg grating liquid flowmeter (chinese patent application 20091004845.0) in which a force of a fluid acting on a round target is transmitted to a fiber bragg grating by using a device such as the round target and a connecting rod, and the flow rate is measured by measuring the amount of movement of the central reflection wavelength of the fiber bragg grating. The design realizes sealing through the shaft seal diaphragm, has a complex structure and low reliability.
In the invention patent (a fiber grating temperature sensor) with the application number of CN201010141147.4, the fiber grating is ensured to have stronger protection strength by adopting a packaging tube made of metal, glass or ceramic materials for packaging; however, the grating senses the ambient temperature outside the packaging tube mainly by sensing the heat of the airtight gas in the packaging tube, so that the grating is easily deformed due to the expansion pressure of the internal gas at high temperature, and the response lag (thermal inertia is too large) is easily caused due to the influence of the internal heat dissipation speed when the ambient temperature is reduced, and the sensor can only detect the temperature, but cannot detect the pressure in the same environment at the same time.
The invention patent of application number CN107300401a (an integrated optical fiber sensor for simultaneously measuring temperature, pressure and flow) proposes an integrated optical fiber sensor for simultaneously measuring temperature, pressure and flow, and although the structure can realize the simultaneous measurement of temperature, pressure and flow, there are still several problems: first: the presence of a strain bar or thin-walled cylinder that mechanically amplifies the signal, thus making the volume still large; secondly, the 4 fiber gratings are distributed at a plurality of crossed or even vertical positions, so that the bending radius of the fiber is limited, and the volume of the sensor is also larger; thirdly, the strain bars or the thin-walled cylinders have complex structures, meanwhile, the force transmission mechanisms are more, error accumulation is easy to cause, and the manufacturing and assembling processes are complex, so that repair and maintenance are difficult. Fourth, the principle adopted by the invention for measuring the temperature by adopting the fiber bragg grating is that on a solid cylinder, although the temperature response is faster, the sensitivity is not high, the temperature response is still influenced by the strain of vibration or pressure fluctuation of a pipe fitting, and the measurement error is larger; finally, the invention adopts the principle that the pressure is measured by measuring the center wavelength of the third fiber grating 7 and the fourth fiber grating 8 (temperature measuring grating). In this way, the measurement of the pressure is also inaccurate and error-prone for the fourth fiber grating 8 (temperature measurement grating).
The sensor connector and the packaging method which are packaged in the hydraulic pipeline and can detect pressure, temperature, flow and pressure pulsation simultaneously are necessary for fault diagnosis of a hydraulic system.
Disclosure of Invention
The invention provides a manufacturing and packaging method of a sensor assembly for fluid multiparameter measurement, which is characterized in that a brand-new sensor assembly structure is analyzed and researched, the sensor assembly is quickly assembled and formed by adopting a reasonable and ingenious manufacturing and packaging method, the pressure, the temperature, the flow and the pressure pulsation in a hydraulic pipeline can be detected at the same time, the feasibility of the manufacturing and packaging method of the whole sensor assembly is high, the manufacturing and packaging success rate is high, the product performance is stable and reliable, the manufacturing and packaging cost of the product is controlled in a reasonable range, and all parts of the sensor assembly are skillfully manufactured and assembled, so that the problems in the prior art are solved.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method of fabricating and packaging a sensor assembly for fluid multiparameter measurements, comprising the steps of:
s1: material preparation and preassembling
The four-way pipe joint comprises a first joint and a second joint for fixing the composite sensor and the optical cable, and a third joint and a fourth joint for transmitting pipeline liquid; the sealing plug, the supporting framework, the compression cover plate, the adjusting gasket, the supporting gasket, the nut and the retaining gasket are assembled and preassembled into the first joint and the second joint according to the connection relation;
The composite sensor comprises a lower shell, an upper shell, a connecting cover, a sensitization sheet and 6 optical fibers;
the lower shell is internally provided with at least two partition boards, the partition boards are vertical to the ellipsoids in the longitudinal direction, and the lower parts of the partition boards are provided with diversion holes for the flow of silicone oil; protruding parts are arranged at two ends of the outer part of the lower shell and used for positioning the structure; the side wall is provided with a temperature measuring metal wire with two ends extending to the inside and the outside of the shell;
the sensitization sheet is arranged at the middle upper part of the baffle plate which is closely adjacent to the middle part of the lower shell, a slotted hole is correspondingly formed for placing the sensitization sheet, and one end of the sensitization sheet is provided with a groove for clamping with the slotted hole of the baffle plate and is bonded or welded;
the top of the upper shell is provided with a through hole, and the edge of the through hole is polished; the connecting cover comprises a cover plate and a skirt edge, the cover plate is arranged between the upper shell and the lower shell, the skirt edge is arranged at the outer edges of the upper shell and the lower shell and used for protecting the seal between the upper shell and the lower shell from being damaged by high pressure, and the auxiliary layout optical fibers are arranged, the positions of the two ends of the connecting cover, which are opposite to the ellipsoidal part of the inner cavity of the lower shell, are provided with first through holes for allowing the optical fibers to pass through, the positions of the two ends of the skirt edge of the connecting cover, which are opposite to the connecting position of the upper shell, are provided with openings, and the openings at the two ends are respectively provided with a traction rope for forming an optical cable core and used for tensile protection of the outer optical fiber part of the composite sensor; second through holes are respectively formed at the two ends of the upper shell corresponding to the opening positions of the connecting cover; the openings at the two ends of the connecting cover and the second through holes are used for leading the optical fibers in the shell to pass in and out the composite sensor after being coiled;
6 optical fibers are respectively inscribed with 6 gratings, wherein the characteristic values, the inscription depths and the lengths of the gratings are the same, the 6 optical fibers are numbered according to 1-6, and the optical fibers pass through the outside of the composite sensor to form an optical cable;
the lower shell, the upper shell and the connecting cover are preassembled, so that the outer circles at the bottoms of the upper shell and the lower shell can be sleeved into the skirt edge of the connecting cover, the bonding is tight, the bonding sealing is facilitated, and the sealing between the upper shell and the lower shell is protected from being damaged by high pressure;
air bags, heat-conducting silicone oil, hydrogen, heat-conducting adhesive, syringes, plasticine and foaming glue are prepared for standby;
s2: split charging of compound sensor
S2.1 split charging of lower shell
Repairing slotted holes correspondingly formed in two adjacent partition boards in the middle of the lower shell, ensuring the smoothness of the hole walls of the slotted holes, providing activity for the sensitization sheet when heat expansion and cold contraction occur, enabling the sensitization sheet and the partition boards to be in full contact and conducting heat effectively;
bending the sensitization sheet into a tile shape along the longitudinal axis direction, and putting the sensitization sheet into two slotted holes formed in the partition plate;
welding one end of the sensitization sheet with one slot hole by using a welding rod, or bonding one end of the sensitization sheet with the slot hole by using a heat conducting adhesive;
s2.2 optical fiber for measuring penetration temperature
Two first through holes and two openings on the connecting cover are cleaned, the first through holes are formed in two ends of the connecting cover, the openings are formed in two ends of a skirt edge connected with the upper shell, the aperture of each opening is larger than the wire diameter of 2 optical fibers, the aperture of each first through hole is larger than the wire diameter of 1 optical fiber, and smooth passing of the optical fibers is guaranteed;
the No. 1 optical fiber passes through a slotted hole in the central baffle plate of the lower shell to be provided with a sensitization sheet, and the corresponding grating is adhered to the sensitization sheet, so that the grating is ensured to be in the middle of the longitudinal concave surface of the sensitization sheet; smooth carding of the two ends of the No. 1 fiber grating;
s2.3 Assembly of lower housing and connection cover
The free ends of the two ends of the No. 1 fiber bragg grating penetrate through the two openings of the connecting cover and are smoothly carded;
placing the lower shell into a shell fixing frame so that the end face of the lower shell is horizontally upwards; the two free ends of the connecting cover and the No. 1 optical fiber are placed beside the fixing frame, so that the optical fiber is not damaged by bending; then injecting heat conduction silicone oil into the lower shell until the height of the shell reaches 80%, and ensuring that the heat conduction silicone oil accounts for 2/3 to 4/5 of the total volume of the lower shell; then the connecting cover is buckled on the lower shell, and the two free ends of the No. 1 optical fiber in the lower shell are ensured to be still kept freely stretched after the connecting cover is buckled; after confirming that the optical fiber is freely stretched, bonding and sealing the first through hole penetrating out of the optical fiber and the connecting part of the connecting cover and the lower shell by using a heat-conducting adhesive, and waiting for solidification;
And (3) negative pressure packaging: in the curing process, air in the connecting cover and the lower shell is extracted outwards from any one of the first through holes of the connecting cover by using an injector, so that a certain negative pressure is formed in the lower shell and used for checking the sealing effect of the buckling gap, and the gap which is not completely sealed or any one of the first through holes is filled by using a heat-conducting adhesive in a supplementing manner, so that the gap at the connecting position of the connecting cover and the lower shell is sealed reliably until the gap is completely cured;
s2.4, no. 2 fiber bragg grating fixation
Pasting the grating part of the No. 2 optical fiber on the outer side of the shell at the center of the lower part of the lower shell along the long axis direction of the ellipsoidal shell, and respectively bonding and sealing the optical fibers on the two sides of the corresponding grating with the contact part of the shell along the outer side wall of the ellipsoidal composite sensor along the long axis direction by using a heat-conducting adhesive to wait for solidification;
s2.5 split charging of the upper shell
Cleaning the through hole of the upper shell, covering the through hole by using a first heat conduction membrane, bonding and sealing the contact part of the first heat conduction membrane and the shell by using an adhesive, and waiting for solidification; after bonding and curing, pasting a fiber bragg grating of a No. 3 fiber in the middle part of the inner part of the first heat-conducting membrane along the long axis direction of the composite sensor shell, and pasting a fiber bragg grating of a No. 4 fiber outside the first heat-conducting membrane corresponding to the fiber bragg grating, so that the positions and the placing directions of the fiber bragg gratings of the No. 3 fiber and the No. 4 fiber are consistent; the No. 3 optical fiber and the No. 4 optical fiber are respectively bonded and sealed with the contact part of the shell along the inner side wall or the outer side wall of the upper shell by using a heat-conducting adhesive, and the curing is waited;
S2.6, manufacturing a heat conduction cavity: turning the upper shell, filling the plasticine into the upper shell, and scraping to make the plasticine fully fill the inner cavity of the upper shell; after the shell filled with the plasticine is turned over, the plasticine is reversely buckled on a flat plate, the first heat conduction membrane is downwards touched by fingers, and when the edge of the through hole of the shell is just torn and deformed, the pressing is stopped; removing the upper shell from the plasticine, leaving the plasticine on a flat plate, measuring the depth of the first heat-conducting membrane pressed down, enabling a blade to be parallel to a concave part cut off by the flat plate, coloring the periphery of an oval shape of the part left by cutting off, sleeving the part into the upper shell, marking a dyeing part on the inner shell of the upper shell, shearing a second heat-conducting membrane according to the maximum cross-sectional shape of the lower part of the dyeing region, bonding and sealing the contact part of the second heat-conducting membrane and the dyeing region of the lower part of the upper shell by using a heat-conducting adhesive, and waiting for solidification; after solidification, a heat conduction cavity is formed between the first heat conduction membrane and the second heat conduction membrane, heat conduction silicone oil is added into the heat conduction cavity, and gas in the heat conduction cavity is pumped out, so that the heat conduction silicone oil is filled between the first heat conduction membrane and the second heat conduction membrane;
s2.7 manufacturing of air bag and coiling and fixing of optical fiber in shell
According to the height of the rubber mud base, an air bag with heat conducting gas inside is manufactured, and the maximum diameter of the air bag is not larger than the height of the rubber mud base;
the air bag is adhered to the middle of the cover plate of the connecting cover by using a heat-conducting adhesive, and is fixed, so that the air bag is prevented from flying;
the No. 1 optical fiber extends out of the extending section (left section and right section) of the first through hole of the connecting cover, bypasses the top end of the air bag from one of the first through holes according to the requirement of the minimum bending diameter, and naturally penetrates out through an opening of the skirt edge of the connecting cover beside the other first through hole to be intersected with the No. 2 optical fiber extending section;
symmetrically, the other end of the No. 1 optical fiber extends out of the extension section of the first through hole of the connecting cover, bypasses the top end of the air bag from the other first through hole according to the requirement of the minimum bending diameter, naturally penetrates out through an opening of the skirt edge of the connecting cover opposite to the first through hole, and is intersected with the extension section of the other side of the No. 2 optical fiber;
after the No. 1 optical fiber passes through the two first through holes at the end part of the connecting cover, the two first through holes respectively correspond to the two ends of the No. 2 optical fiber along the long axis of the composite sensor, and can be finally converged together; the contact part of the optical fiber and the air bag or the connecting cover is bonded and fixed by a heat-conducting adhesive to wait for solidification;
The remaining two sections of the optical fiber No. 3 which are not fixed are respectively penetrated out from the second adjacent through holes after surrounding the inside of the upper shell for a circle, so that the bending radius is prevented from being too small, and the contact part with the inside of the upper shell is bonded and fixed by a heat conducting adhesive; combining the remaining two sections of unfixed optical fibers of the No. 4 optical fiber with the inlet and outlet ends of the No. 3 optical fiber at the second through hole of the upper shell;
fixing the lower shell, the connecting cover and the air bag of the coiled and fixed optical fiber on the mounting bracket, and mutually buckling the upper shell and the connecting cover of the coiled and fixed optical fiber to ensure that the second through holes of the upper shell correspond to the openings of the skirt edges of the connecting cover, and ensuring that the No. 1 optical fiber and the No. 3 optical fiber entering and exiting the two second through holes are not sheared; the heat-conducting adhesive is filled in the buckled contact position of the upper shell and the connecting cover for bonding, sealing and fixing;
s2.8, optical cable manufacture
The fiber gratings of the No. 5 optical fiber and the No. 6 optical fiber are respectively fixed in the center of the outer side wall of the skirt edge of the oval connecting cover in the short axis direction by using a heat conducting adhesive, so that the gratings are symmetrically arranged about the longitudinal axis of the skirt edge of the oval connecting cover; then, the optical fibers at the two ends of each grating are placed at a position close to the second through hole along the outer side wall of the connecting cover and fixed by using glue; the movable parts at the two ends of the No. 5 optical fiber and the No. 6 optical fiber are respectively intersected with the intersection end of the corresponding side of the No. 1 optical fiber and the No. 2 optical fiber and the intersection section of the corresponding side of the No. 3 optical fiber and the No. 4 optical fiber at the opening of the connecting cover, and the two ends after intersection are respectively intersected with the traction rope as a cable core in sequence and are stuck together to prepare for forming an optical cable;
After numbering and confirming the optical fibers arranged around the traction rope, arranging a reinforcing piece at the center of a wire harness formed by taking the traction rope as 6 optical fibers; hooking the reinforcement into the opening of the connecting cover, and bonding and fixing the reinforcement by using a heat-conducting adhesive; according to the method for manufacturing the optical cable, a protective sleeve is manufactured outside 6 optical fibers, so that two bundles of optical cables are manufactured at two ends of the composite sensor;
s2.9, injecting foaming glue into the space among the upper shell, the air bag and the connecting cover for solidification through a guide pipe at the openings of the upper shell and the connecting cover, so as to fix the air bag, the optical fiber and the sealing effect;
the composite sensor and the optical cable are packaged, sealed and compositely reinforced by using the film, so that the temperature measuring metal wire is arranged in an outward extending way after passing through the composite sensor and the film; meanwhile, the positioning piece at the outer end of the shell or the connecting cover penetrates through the composite sensor and the film and then extends outwards;
s3: split charging of pipe joints
S3.1, selecting a pipe joint with specification matched with a hydraulic system
According to the hydraulic pipe diameter and the connection mode of a hydraulic system to be connected, a four-way pipe joint matched with a pipeline of the hydraulic system is selected, wherein the four-way pipe joint comprises a first joint and a second joint for fixing the composite sensor and an optical cable, and a third joint and a fourth joint for transmitting pipeline liquid;
S3.2, determination and identification of the orientation of the sealing plug and the third and fourth joints
Abutting the sealing plug with the corresponding part of the positioning piece at the outer end of the composite sensor, fitting the mounting cavities in the first joint and the second joint of the four-way pipe joint, ensuring that the No. 5 fiber bragg grating and the No. 6 fiber bragg grating respectively correspond to the centers of the through-flow apertures of the third joint or the fourth joint, and then marking the positions of the sealing plug relative to the positions of the first joint and the second joint by the No. 5 fiber bragg grating and the No. 6 fiber bragg grating; the position of the 3 rd fiber grating and the 4 th fiber grating, which is vertical to the central connecting line of the through-flow aperture of the third joint or the fourth joint, is symmetrical to the 2 nd fiber grating about the elliptical shell, is marked as the upward position of the pipe joint, and the 2 nd fiber grating is correspondingly positioned below the arrow and is marked by the corresponding arrow;
s4: assembly
S4.1, loading the marked sealing plug and the composite sensor into a first joint and a second joint of the four-way pipe joint according to the marking position, leading out optical cables at two ends, sequentially adding an adjusting gasket at two ends, supporting the gasket and a backstop gasket, and ensuring that inner clamping claws of the backstop gasket are placed into grooves of the first joint/the second joint;
S4.2, fixedly connecting a compression cover plate with one end face of a nut, connecting the other end face of the nut with the outer end of a first joint or a second joint of the four-way pipe joint in a threaded manner, and driving the compression cover plate on the nut to fix the composite sensor at a specified position through a supporting gasket, an adjusting gasket and a sealing plug by screwing the nut at the outer end of the first joint or the second joint;
s4.3, fixing the nut by using an outer locking plate of the backstop gasket to prevent loosening;
and installing optical fiber connectors at the outer end of the optical cable according to the marks, fixing six optical fiber positions in each connector according to the numbers, respectively corresponding to the No. 1-6 optical fibers, and ensuring that the No. 5 optical fiber grating and the No. 6 optical fiber grating respectively correspond to the positions of the third connector and the fourth connector.
Further, the lower shell and the upper shell are respectively made of high-strength casting alloy based on Al-Cu, are arranged into a semi-ellipsoidal shape, at least two partition plates are cast in the shell, the partition plates are parallel or perpendicular to the longitudinal axis of the ellipsoidal composite sensor, and a diversion hole is formed in the partition plate of the lower shell and used for silicone oil to flow; the middle part of the baffle plate adjacent to the middle part of the shell is provided with a slotted hole correspondingly for placing the sensitization piece; protruding parts are cast at two ends of the outer parts of the upper shell and the lower shell and are arranged as positioning pieces, and temperature measuring metal wires which are in and out of the shells are cast on the side wall of the lower shell.
Further, after the composite sensor is mounted on the four-way pipe joint, a bypass inspection is added, visual inspection is carried out before the composite sensor is mounted on the sealing plugs, enough space is reserved between the composite sensor and the two sealing plugs, the hydraulic diameter of the upper side and the lower side of the position of the composite sensor is ensured to be not smaller than 1/2 of the hydraulic diameter of an inlet and an outlet of the pipe joint, or compressed air is introduced from the third joint and the fourth joint, and when the pressure drop is measured by a pressure drop checking method, the pressure drop is judged to be not larger than 0.1 bar.
Further, the positioning members are formed by casting protruding portions, which may be tapered or cylindrical, at both outer ends of the upper and lower cases, and at least two protruding portions are necessary at one end of each half case, and a gap is ensured between the protruding portions.
Furthermore, the heat conduction cavity is required to be filled with heat conduction silicone oil, so that the ambient temperature of the No. 3 grating and the No. 4 grating is ensured to be nearly consistent.
Further, the first heat conduction membrane and the second heat conduction membrane adopt heat conduction silica gel sheets, and the temperature resistant range is between 50 ℃ below zero and 220 ℃; the air bag also adopts a heat conduction silica gel sheet, which is beneficial to the heat balance in the shell, thereby ensuring the measurement precision. The first heat-conducting membrane can be preferably a high-heat-conducting graphene membrane, a heat-conducting silica gel membrane or a heat-conducting metal membrane so as to adapt to different pressure application occasions.
Furthermore, the heat-conducting adhesive adopts RTV organic silicon elastic glue, and the temperature resistance range is between minus 55 ℃ and 300 ℃; the tensile strength is not less than 10MPa.
Further, step S3.2 can identify the flow direction in the use of the subsequent compound sensor to make the sign, the weight of the upper half part of the compound sensor is smaller than that of the lower half part, so that the upper half part is installed upwards, fatigue damage of additional torque to the sealing plug is avoided, the heat-conducting silicone oil in the lower shell is also enabled to be in a sealed shell, the leakage risk is reduced, and the temperature in the heat-conducting silicone oil is enabled to be in the same temperature field as that of the grating temperature pressure sensor of the compound sensor.
Furthermore, the foaming glue is filled in the step S2.9, so that the fixation of the grating in the heat conducting cavity is ensured, the self weight of the heat conducting silicone oil in the heat conducting cavity is supported, and the needle eye of the syringe after the needle head is extracted can be sealed.
Furthermore, the connecting cover is cast by Ti-6Al-4V alloy, and the temperature measuring metal wire is made of metal or alloy with excellent heat conductivity and good toughness; the sensitization piece is made of metal or alloy with excellent heat conduction.
The structure has the advantages that the novel sensor assembly structure is analyzed and researched, the sensor assembly is rapidly assembled and formed by adopting a reasonable and ingenious manufacturing and packaging method, the pressure, the temperature, the flow and the pressure pulsation in a hydraulic pipeline can be detected simultaneously, the manufacturing and packaging method of the whole sensor assembly is high in feasibility, the manufacturing and packaging success rate is high, the product performance is stable and reliable, the manufacturing and packaging cost of the product is controlled in a reasonable range, and all parts of the sensor assembly are manufactured and assembled skillfully.
Drawings
Fig. 1 is a schematic overall sectional structure of the present invention.
Fig. 2 is a schematic structural diagram of the composite sensor of the present invention.
FIG. 3 is a schematic cross-sectional view of the structure of FIG. 2 in the direction A-A.
Fig. 4 is a schematic sectional view of the structure in the direction B-B in fig. 2.
Fig. 5 is a schematic cross-sectional view of an optical cable according to the present invention.
Fig. 6 is a schematic structural view of a support pad of the present invention.
FIG. 7 is a graph of bend diameter versus break time for an optical fiber of the present invention.
In the drawing the view of the figure,
1. a four-way pipe joint; 11. a first joint; 12. a second joint; 13. a third joint; 14. A fourth joint;
2. a composite sensor; 201. a housing; 2011. an upper housing; 2012. a lower housing; 2013. a connection cover; 202. fiber No. 1; 203. fiber No. 2; 204. fiber No. 3; 205. Fiber No. 4; 206. fiber No. 5; 207. fiber No. 6; 208. a first heat conductive film; 209. an elastomer; 2091. an air bag; 2092. an elastic substance; 210. a sensitization tablet; 211. a temperature measuring wire; 212. a partition plate; 213. a second heat conductive film; 214. a first optical fiber group; 215. a second optical fiber group; 216. an optical cable tap; 217. a heat conducting cavity; 218. a positioning piece; 219. a slot hole; 220. a deflector aperture; 221. a first through hole; 222. a second via hole; 223. an opening;
3. A sealing plug;
4. a reinforcing member;
5. a sealing structure; 501. a nut; 502. compressing the cover plate; 503. adjusting the gasket; 504. a backstop pad; 505. a support pad; 5051. a groove; 506. and supporting the framework.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present application will be described in detail below with reference to the following detailed description and the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.
In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1-7, a method for manufacturing and packaging a sensor assembly for fluid multiparameter measurement includes the steps of:
s1: material preparation and preassembling
The four-way pipe joint 1, the four-way pipe joint 1 comprises a first joint 11 and a second joint 12 for fixing the composite sensor 2 and the optical cable, and a third joint 13 and a fourth joint 14 for transmitting pipeline liquid; the sealing plug 3, the supporting framework 506, the pressing cover plate 502, the adjusting gasket 503, the supporting gasket 505, the nut 501 and the stopping gasket 504 are assembled and preloaded into the first joint 11 and the second joint 12 according to the connection relation;
a composite sensor 2, the composite sensor 2 including a lower housing 2012, an upper housing 2011, a connection cover 2013, a sensitization sheet 210, and 6 optical fibers;
the lower shell 2012, at least two baffle plates 212 are arranged in the lower shell 2012, the baffle plate structure can be like the structure of the deep sea fish skull, two baffle plates 212 which are vertical to the longitudinal direction of the ellipsoid are selected, and a diversion hole 220 is formed on the baffle plates for the flow of silicone oil; protruding portions are provided at both outer ends of the lower housing 2012 for structural positioning; the side wall is provided with a temperature measuring metal wire 211 with two ends extending into and out of the shell;
referring to fig. 3 and 4, the sensitization sheet 210: the middle upper part of the baffle plate 212 closely adjacent to the middle part of the lower shell is correspondingly provided with slotted holes 219, each slotted hole 219 is used for placing a sensitization sheet 210, and a slot is arranged on the sensitization sheet 210 at one slotted hole 219 and is used for being clamped with the slotted hole 219 of the baffle plate 212, and bonding or welding is carried out, so that the sensitization sheet 210 and the baffle plate 212 are fully contacted and effectively conduct heat; the other end of the sensitization sheet 210 is suspended in the other slot 219, and can expand with heat and contract with cold freely without being blocked;
A through hole is formed in the top of the upper shell 2011, and the edge of the through hole is polished;
the connecting cover 2013, the connecting cover 2013 comprises a cover plate and a skirt, the cover plate is arranged between the upper shell 2011 and the lower shell 2012, the skirt is arranged at the outer edges of the upper shell 2011 and the lower shell 2012 and is used for protecting the seal between the upper shell 2011 and the lower shell 2012 from being damaged by high pressure, and the arrangement of auxiliary layout optical fibers is carried out, the positions of the two ends of the connecting cover, which are opposite to the ellipsoidal part of the inner cavity of the lower shell 2012, are provided with first through holes 221 for allowing the optical fibers to pass through, the positions of the two ends of the skirt of the connecting cover 2013, which are opposite to the connecting position of the upper shell 2011, are provided with openings 223, and the openings 223 at the two ends are respectively provided with pulling ropes for forming an optical cable core and used for tensile protection of the outer optical fiber part of the composite sensor 2; the two ends of the upper housing 2011 are respectively provided with a second through hole 222 corresponding to the opening 223 of the connecting cover 2013; the opening 223 and the second through hole 222 at both ends of the connection cover 2013 are used for the optical fiber coiling inside the shell 201 to enter and exit the composite sensor 2;
6 optical fibers are respectively recorded with 6 gratings in the middle of the optical fibers, the characteristic values, the recording depth and the length of the gratings are the same, the 6 optical fibers are numbered according to 1-6, the optical fibers penetrate out of the composite sensor 2 and then form a main body of an optical cable together with the traction rope as a cable core, and a protective sleeve is manufactured out of the 6 optical fibers according to the optical cable manufacturing method, so that two bundles of optical cables are manufactured at two ends of the composite sensor 2; the connection of the optical cable outside the compound sensor 2 with other compound sensors can be in the form of thermal welding or cold welding through an optical cable tap according to the space position.
The lower shell 2012, the upper shell 2011 and the connecting cover 2013 are preassembled, so that the bottom excircles of the upper shell 2011 and the lower shell 2012 can be sleeved into the skirt edge of the connecting cover 2013, the close fitting is ensured, and the adhesive sealing and the protection of the sealing between the upper shell 2011 and the lower shell 2012 from high-pressure loss are facilitated;
the air bag 2091, heat-conducting silicone oil, hydrogen, heat-conducting adhesive, injector, plasticine and foaming glue are prepared for standby;
s2: split charging of compound sensor
S2.1 split charging of lower shell
Referring to fig. 3 and 4, the corresponding slotted holes 219 are formed in the two adjacent partition plates 212 in the middle of the lower housing 2011, so as to ensure the hole walls of the slotted holes 219 to be smooth and provide the activity for the sensitized solar cell 210 when expanding with heat and contracting with cold. The sensitization sheet 210 is bent into a tile shape along the longitudinal axis direction and is put into two slotted holes 219 formed in the partition plate 212;
one end of the sensitization sheet 210 is welded with one slot 219 by using a welding rod, or one end of the sensitization sheet 210 is adhered with the slot 219 by using a heat conducting adhesive, so that the sensitization sheet 210 and the partition 212 are fully contacted and effectively conduct heat;
s2.2 optical fiber for measuring penetration temperature
Cleaning two first through holes 221 and two openings 223 on the connecting cover 2013, wherein the first through holes 221 are formed in two ends of the connecting cover 2013, the openings 223 are formed in two ends of a skirt edge connected with the upper shell 2011, the aperture of the openings 223 is larger than the line diameter of 2 optical fibers, and the aperture of the first through holes 221 is larger than the line diameter of 1 optical fiber, so that the optical fibers can pass smoothly;
The optical fiber 202 of the No. 1 is penetrated through a slotted hole 219 of the sensitization sheet 210 arranged on a central baffle plate of the lower shell 2012, and a corresponding grating is adhered to the sensitization sheet 210, so that the grating is ensured to be in the middle of a longitudinal concave surface of the sensitization sheet 210; smooth carding of the two ends of the No. 1 fiber 202 grating;
s2.3 Assembly of lower housing and connection cover
The free ends at the two ends of the No. 1 fiber 202 grating penetrate through the two openings of the connecting cover 2013 and are combed smoothly;
placing the lower housing 2012 in a housing mount such that the end face of the lower housing 2012 is placed horizontally upward; the two free ends of the connecting cover 2013 and the No. 1 optical fiber 202 are placed beside the fixing frame, so that the optical fibers are not damaged by bending; then, injecting heat conduction silicone oil into the lower shell 2013 until the height of the shell reaches 80%, wherein the heat conduction silicone oil accounts for 2/3 to 4/5 of the total volume of the lower shell 2012; then, the connecting cover 2013 is buckled on the lower shell, and the two free ends of the No. 1 optical fiber 202 in the lower shell 2012 are ensured to be still free to stretch after the connecting cover 2013 is buckled; after confirming that the optical fiber is freely stretched, bonding and sealing with a heat conductive adhesive at the first through hole 221 where the optical fiber is penetrated out and at the connection of the connection cover 2013 and the lower case 222, waiting for curing;
And (3) negative pressure packaging: in the curing process, air in the connecting cover 2013 and the lower shell 2012 is extracted outwards from any one of the first through holes 221 of the connecting cover by using a syringe, so that a certain negative pressure is formed in the lower shell 2012, the sealing effect at the buckling gap is checked, and the gap which is not completely sealed or any one of the first through holes 221 is filled with a heat-conducting adhesive, so that the gap at the connecting position of the connecting cover 2013 and the lower shell 2012 is ensured to be sealed reliably until the gap is completely cured;
s2.4, no. 2 fiber bragg grating fixation
The grating part of the No. 2 optical fiber 203 is stuck to the outer side of the shell 201 in the center of the lower part of the lower shell 2012 along the long axis direction of the ellipsoidal shell, and the optical fibers at the two sides of the corresponding grating are respectively stuck and sealed with the contact part of the shell 201 along the outer side wall of the ellipsoidal composite sensor 2 along the long axis direction by using a heat-conducting adhesive, and the bonding is waited for solidification;
s2.5 split charging of the upper shell
Cleaning the through hole of the upper shell 2011, covering the through hole by using the first heat conduction membrane 208, bonding and sealing the contact part of the first heat conduction membrane 208 and the shell by using an adhesive, and waiting for solidification; after bonding and curing, pasting the fiber bragg grating of the No. 3 optical fiber 204 on the middle part inside the first heat conduction diaphragm 208 along the long axis direction of the composite sensor 2 shell, and pasting the fiber bragg grating of the No. 4 optical fiber 205 on the outer side of the first heat conduction diaphragm 208 corresponding to the fiber bragg grating, so as to ensure that the positions and the placement directions of the fiber bragg gratings of the No. 3 optical fiber 204 and the No. 4 optical fiber 205 are consistent; the optical fiber No. 3 204 and the optical fiber No. 4 205 are bonded and sealed with the contact part of the housing 201 along the inner or outer side wall of the upper housing 2011 by a heat conductive adhesive, and wait for solidification;
S2.6, manufacturing a heat conduction cavity: turning the upper shell 2011, filling plasticine into the upper shell 2011, and strickling to enable the plasticine to fill the inner cavity of the upper shell 2011; after the shell filled with the plasticine is turned over, the plasticine is reversely buckled on a flat plate, the first heat conduction membrane 208 is pressed downwards by fingers, and when the edge of the through hole of the shell 2011 is just torn and deformed, the pressing is stopped; removing the upper shell 2011 from the plasticine, leaving the plasticine on a flat plate, measuring the depth of the first heat-conducting membrane 208 pressed down, enabling a blade to be parallel to a concave part cut off by the flat plate, coloring the periphery of an oval shape of the part left by cutting off, sleeving the part into the upper shell 2011, marking a dyeing part on the inner shell of the upper shell 2011, shearing the second heat-conducting membrane 213 according to the maximum section shape of the lower part of the dyeing region, bonding and sealing the contact part of the second heat-conducting membrane 213 and the dyeing region of the lower part of the upper shell 2011 by using a heat-conducting adhesive, and waiting for curing; after curing, a heat conduction cavity 217 is formed between the first heat conduction membrane 208 and the second heat conduction membrane 213, heat conduction silicone oil is added into the heat conduction cavity 217, and gas in the heat conduction cavity 217 is pumped out, so that the heat conduction silicone oil is filled between the first heat conduction membrane 208 and the second heat conduction membrane 213;
S2.7 manufacturing of air bag and coiling and fixing of optical fiber in shell
According to the rubber mud base height, an air bag 2091 with heat conducting gas is manufactured, and the maximum diameter of the air bag 2091 is not larger than the rubber mud base height;
the air bag 2091 is adhered to the middle of the cover plate of the connecting cover 2013 by a heat-conducting adhesive, and the air bag 2091 is fixed to prevent flying; optimally, the air bag is filled with heat-conducting silicone oil, thereby playing the roles of heat conduction and damping enhancement.
Referring to fig. 2 and 3, the optical fiber 202 No. 1 is extended out of the extension section (left and right two sections) of the first through hole 221 of the connection cover 2013, and bypasses the top end of the air bag 2091 from one of the first through holes 221 according to the requirement of the minimum bending diameter, and naturally passes out through the opening 223 of the skirt of the connection cover 2013 beside the other first through hole 221 to meet the extension section of the optical fiber 203 No. 2;
symmetrically, the other end of the fiber No. 1 202 extends out of the extension section of the first through hole 221 of the connecting cover 2013, bypasses the top end of the air bag 2091 from the other first through hole 221 according to the requirement of the minimum bending diameter, and naturally penetrates out through the opening of the skirt of the connecting cover 2013 at the opposite side of the first through hole 221 to meet the extension section of the other side of the fiber No. 2 203;
After the optical fiber No. 1 202 passes through the two first through holes 221 at the end part of the connecting cover 2013, the optical fibers No. 2 and the optical fibers 203 respectively correspond to the two ends of the long axis of the composite sensor 2, and can be finally converged together; the contact portion of the optical fiber and the air bag 2091 or the connection cover 2013 is bonded and fixed by a heat-conducting adhesive to wait for solidification;
the remaining two unfixed sections of the optical fiber No. 3 204 are respectively penetrated out from the second passing holes 222 immediately adjacent after surrounding the inside of the upper shell 2011 for a circle, so that the bending radius is prevented from being too small, wherein the contact part with the inside of the upper shell 2011 is fixed by bonding with a heat-conducting adhesive; combining the remaining two unfixed lengths of fiber 205 with the entry and exit ends of fiber 204, at the second through hole 222 of the upper housing 2012;
fixing the lower housing 2012 of the coiled and fixed optical fiber, the connection cover 2013 and the air bag 2091 on a mounting bracket, and mutually fastening the upper housing 2011 of the coiled and fixed optical fiber and the connection cover 2013, so as to ensure that the second through holes 222 of the upper housing correspond to the openings 223 of the skirt edges of the connection cover 2013, and ensure that the No. 1 optical fiber 202 and the No. 3 optical fiber 204 which enter and exit the two second through holes 222 are not sheared; the heat-conducting adhesive is filled in the buckled contact position of the upper shell 2011 and the connecting cover 2013 for bonding, sealing and fixing;
The principle of coiling the optical fiber is as follows: g657 B3 minimum bending radius can reach phi 10mm. When the bending radius of the optical fiber is larger than 5-10 cm, the loss caused by bending is negligible;
as can be seen from fig. 7, the bending diameter is at least 10mm or more in order to ensure engineering requirements (well over a lifetime of 30 days):
s2.8, optical cable manufacture
The fiber gratings of the No. 5 optical fiber 206 and the No. 6 optical fiber 207 are respectively fixed in the center of the outer side wall of the skirt edge of the elliptical connecting cover 2013 in the short axis direction by using a heat conducting adhesive, so that the gratings are symmetrically arranged about the longitudinal axis of the skirt edge of the elliptical connecting cover 2013; then, the optical fibers at the two ends of each grating are placed at the position close to the opening 223 of the skirt along the outer side wall of the connecting cover 2013 and fixed by adhesive; the movable parts at the two ends of the No. 5 optical fiber 206 and the No. 6 optical fiber 207 are respectively intersected with the intersection ends of the corresponding sides of the No. 1 optical fiber 202 and the No. 2 optical fiber 203 and the intersection sections of the corresponding sides of the No. 3 optical fiber 204 and the No. 4 optical fiber 205 at the opening 223 of the connecting cover 2013, and the two ends after intersection are respectively intersected with the traction rope as a cable core in sequence and are stuck together to prepare for forming an optical cable;
a reinforcing member 4 provided at the center of a harness formed by 6 optical fibers as a pulling rope after numbering and confirming the optical fibers arranged around the pulling rope; hooking the reinforcement 4 into the opening of the connection cover 2013, and bonding and fixing the reinforcement with a heat-conducting adhesive; according to the method for manufacturing the optical cable, a protective sleeve is manufactured outside 6 optical fibers, so that two bundles of optical cables are manufactured at two ends of the composite sensor 2;
S2.9, at the opening 223 of the upper shell 2011 and the connecting cover 2013, injecting foaming glue into the space among the upper shell 2011, the air bag 2091 and the connecting cover 2013 through a catheter for solidification, so as to fix the air bag, the optical fiber and the sealing effect;
the composite sensor 2 and the optical cable are encapsulated and reinforced by using the film, so that the temperature measuring metal wire 211 passes through the composite sensor 2 and the film and then extends outwards; simultaneously, the positioning piece 218 at the outer end of the shell 201 or the connecting cover 2013 passes through the composite sensor 2 and the film and then extends outwards;
it will be appreciated that two optical cables, namely a first optical fiber group 214 and a second optical fiber group 215 formed of 6 optical fibers, extend outwardly from both ends of the composite sensor 2.
S3: split charging of pipe joints
S3.1, selecting a pipe joint with specification matched with a hydraulic system
According to the hydraulic pipe diameter and the connection mode of a hydraulic system to be connected, a four-way pipe joint 1 matched with a pipeline of the hydraulic system is selected, wherein the four-way pipe joint 1 comprises a first joint 11 and a second joint 12 for fixing a composite sensor 2 and an optical cable, and a third joint 13 and a fourth joint 14 for transmitting pipeline liquid;
s3.2, determination and identification of the orientation of the sealing plug and the third and fourth joints
Referring to fig. 1, the sealing plug 3 is abutted with the corresponding part of the positioning piece 218 at the outer end of the composite sensor 2, the installation cavities in the first joint 11 and the second joint 12 of the four-way pipe joint 1 are tried on, the centers of the through-flow apertures of the No. 5 fiber bragg grating and the No. 6 fiber bragg grating corresponding to the third joint 13 or the fourth joint 14 are ensured, and then the positions of the sealing plug 3 relative to the positions of the first joint 11 and the second joint 12 are identified by the positions of the No. 5 fiber bragg grating and the No. 6 fiber bragg grating; the No. 3 fiber bragg grating and the No. 4 fiber bragg grating are positioned at the positions perpendicular to the central connecting line of the through-flow aperture of the third connector 13 or the fourth connector 14, are symmetrical to the No. 2 fiber bragg grating about the elliptical shell, are marked as the upward positions of the pipe joints, are correspondingly positioned below arrows, and are marked by corresponding arrows;
s4: assembly
S4.1, the marked sealing plug 3 and the compound sensor 2 are arranged in the first joint 11 and the second joint 12 of the four-way pipe joint 1 according to the marking positions, optical cables are led out from two ends, an adjusting gasket 503, a supporting gasket 505 and a backstop gasket 504 are sequentially added to two ends, and the inner clamping claws of the backstop gasket 504 are ensured to be placed in the grooves 5051 of the first joint 11/the second joint 12;
S4.2, fixedly connecting a compression cover plate 502 with one end face of a nut 501, connecting the other end face of the nut 501 with the outer end of a first joint 11 or a second joint 12 of the four-way pipe joint 1 in a threaded manner, and driving the compression cover plate 502 on the nut 501 to fix the composite sensor 2 at a specified position through a supporting gasket 505, an adjusting gasket 503 and a sealing plug 3 by screwing the nut at the outer end of the first joint 11 or the second joint 12;
s4.3, fixing the nut by using an outer locking plate of the backstop gasket 504 to prevent loosening;
at the outer end of the optical cable, optical fiber connectors are arranged according to the marks, six optical fiber positions in each connector are fixed according to the numbers, the optical fibers respectively correspond to the No. 1-6, and the No. 5 optical fiber grating and the No. 6 optical fiber grating are guaranteed to respectively correspond to the positions of the third connector 13 and the fourth connector 14.
In a preferred embodiment, the lower shell 2012 and the upper shell 2011 are made of high-strength casting alloy based on Al-Cu, and are in a semi-ellipsoidal shape, at least two baffles are cast in the shell 201, the baffles 212 are parallel or perpendicular to the longitudinal axis of the ellipsoidal composite sensor 2, and a diversion hole 220 is formed in the baffles 212 of the lower shell 2012 for silicone oil to flow; the middle upper part of the baffle plate 212 closely adjacent to the middle part of the shell is correspondingly provided with a slotted hole 219 for placing the sensitization piece 210; protruding portions are cast at both outer ends of the upper housing 2011 and the lower housing 2012, provided as positioning pieces 218, and side walls of the lower housing 2012 are cast with temperature measuring wires 211 together with the inside and outside of the housing 201.
Still further, referring to fig. 3 and 4, a deflector hole 220 is provided on the separator 212 for the flow of the heat conductive silicone oil.
In a preferred embodiment, referring to fig. 1, after the composite sensor 2 is mounted on the four-way pipe joint 1, a bypass check is added, and before the composite sensor 2 is mounted on the sealing plugs 3, a sufficient space is left between the composite sensor 2 and the two sealing plugs 3, so that the hydraulic diameter passing through the upper side and the lower side of the position of the composite sensor 2 is not smaller than 1/2 of the hydraulic diameter of the inlet and the outlet of the pipe joint, or compressed air is introduced from the third joint 13 and the fourth joint 14, and when the pressure drop is measured by checking the pressure drop, the pressure drop is not larger than 0.1bar, the judgment is made as smooth.
In a preferred embodiment, and referring to fig. 1, the positioning member 218 is formed by casting protruding portions, which may be tapered or cylindrical, at both outer ends of the upper housing 2011 and the lower housing 2012, at least two protruding portions being necessary at one end of each half housing, and a gap being secured between the protruding portions.
In a preferred embodiment, referring to fig. 3, the thermally conductive cavity 217 must be filled with thermally conductive silicone oil to ensure that the ambient temperatures of the No. 3 and No. 4 gratings are nearly uniform.
In a preferred embodiment, the first and second thermally conductive membranes 208 and 213 are made of thermally conductive silicon sheets, and the temperature resistance range is-50 ℃ to 220 ℃; the air bag 2091 is also made of a heat-conducting silicon sheet, and optimally, the air bag is fully filled with heat-conducting silicone oil, so that the effects of heat conduction and damping enhancement are achieved. The heat balance inside the shell is facilitated, so that the measurement accuracy is ensured. Specifically, the first heat-conducting membrane 208 is preferably a high heat-conducting graphene membrane or a heat-conducting silica gel membrane at low or medium pressure, and the tensile strength of the first heat-conducting membrane 208 or the adhesive is not less than 10 MPa; in the high-pressure system, a heat-conducting metal diaphragm with tensile strength not less than 1.5 times of the system pressure is adopted.
In a preferred embodiment, the thermally conductive adhesive is an RTV silicone elastomer having a temperature resistance in the range of-55 ℃ to 300 ℃; the tensile strength is not less than 10MPa. The bonding strength of the thermally conductive adhesive is enhanced by the bonded area.
In the preferred embodiment, step S4.3 can make a mark for identifying the flow direction in the use of the subsequent composite sensor 2, the weight of the upper half part of the composite sensor 2 is smaller than that of the lower half part, so that the upper half part is installed upwards, fatigue damage of additional torque to the sealing plug 3 is avoided, and the heat-conducting silicone oil in the lower shell 2012 is in a sealed shell, so that the leakage risk is reduced, and the temperature in the heat-conducting silicone oil is in the same temperature field as the grating of the grating temperature pressure sensor of the composite sensor 2.
In the preferred embodiment, the foaming glue filled in step S2.9 not only ensures the fixation of the grating therein, but also supports the self weight of the heat-conducting silicone oil in the heat-conducting cavity 217 and can seal the needle hole after the syringe needle is drawn out.
In a preferred embodiment, the connecting cover 2013 is cast from a Ti-6Al-4V alloy, and the temperature measuring wire 211 is made from a metal or alloy with excellent heat conductivity and good toughness, such as silver, copper and the like; the sensitization piece is made of metal or alloy with excellent heat conduction.
The above embodiments are not to be taken as limiting the scope of the invention, and any alternatives or modifications to the embodiments of the invention will be apparent to those skilled in the art and fall within the scope of the invention.
The present invention is not described in detail in the present application, and is well known to those skilled in the art.
Claims (10)
1. A method of making and packaging a sensor assembly for fluid multiparameter measurements, comprising the steps of:
s1: material preparation and preassembling
The four-way pipe joint comprises a first joint and a second joint for fixing the composite sensor and the optical cable, and a third joint and a fourth joint for transmitting pipeline liquid; the sealing plug, the supporting framework, the compression cover plate, the adjusting gasket, the supporting gasket, the nut and the retaining gasket are assembled and preassembled into the first joint and the second joint according to the connection relation;
the composite sensor comprises a lower shell, an upper shell, a connecting cover, a sensitization sheet and 6 optical fibers;
the lower shell is internally provided with at least two partition boards, the partition boards are vertical to the ellipsoids in the longitudinal direction, and the lower parts of the partition boards are provided with diversion holes for the flow of silicone oil; protruding parts are arranged at two ends of the outer part of the lower shell and used for positioning the structure; the side wall is provided with a temperature measuring metal wire with two ends extending to the inside and the outside of the shell;
The sensitization sheet is arranged at the middle upper part of the baffle plate which is closely adjacent to the middle part of the lower shell, a slotted hole is correspondingly formed for placing the sensitization sheet, and one end of the sensitization sheet is provided with a groove for clamping with the slotted hole of the baffle plate and is bonded or welded;
the top of the upper shell is provided with a through hole, and the edge of the through hole is polished; the connecting cover comprises a cover plate and a skirt edge, the cover plate is arranged between the upper shell and the lower shell, the skirt edge is arranged at the outer edges of the upper shell and the lower shell and used for protecting the seal between the upper shell and the lower shell from being damaged by high pressure, and the auxiliary layout optical fibers are arranged, the positions of the two ends of the connecting cover, which are opposite to the ellipsoidal part of the inner cavity of the lower shell, are provided with first through holes for allowing the optical fibers to pass through, the positions of the two ends of the skirt edge of the connecting cover, which are opposite to the connecting position of the upper shell, are provided with openings, and the openings at the two ends are respectively provided with a traction rope for forming an optical cable core and used for tensile protection of the outer optical fiber part of the composite sensor; second through holes are respectively formed at the two ends of the upper shell corresponding to the opening positions of the connecting cover; the openings at the two ends of the connecting cover and the second through holes are used for leading the optical fibers in the shell to pass in and out the composite sensor after being coiled;
6 optical fibers are respectively inscribed with 6 gratings, wherein the characteristic values, the inscription depths and the lengths of the gratings are the same, the 6 optical fibers are numbered according to 1-6, and the optical fibers pass through the outside of the composite sensor to form an optical cable;
The lower shell, the upper shell and the connecting cover are preassembled, so that the outer circles at the bottoms of the upper shell and the lower shell can be sleeved into the skirt edge of the connecting cover, the bonding is tight, the bonding sealing is facilitated, and the sealing between the upper shell and the lower shell is protected from being damaged by high pressure;
air bags, heat-conducting silicone oil, hydrogen, heat-conducting adhesive, syringes, plasticine and foaming glue are prepared for standby;
s2: split charging of compound sensor
S2.1 split charging of lower shell
Repairing slotted holes correspondingly formed in two adjacent partition boards in the middle of the lower shell, ensuring the smoothness of the hole walls of the slotted holes, providing activity for the sensitization sheet when heat expansion and cold contraction occur, enabling the sensitization sheet and the partition boards to be in full contact and conducting heat effectively;
bending the sensitization sheet into a tile shape along the longitudinal axis direction, and putting the sensitization sheet into two slotted holes formed in the partition plate;
welding one end of the sensitization sheet with one slot hole by using a welding rod, or bonding one end of the sensitization sheet with the slot hole by using a heat conducting adhesive;
s2.2 optical fiber for measuring penetration temperature
Two first through holes and two openings on the connecting cover are cleaned, the first through holes are formed in two ends of the connecting cover, the openings are formed in two ends of a skirt edge connected with the upper shell, the aperture of each opening is larger than the wire diameter of 2 optical fibers, the aperture of each first through hole is larger than the wire diameter of 1 optical fiber, and smooth passing of the optical fibers is guaranteed;
The No. 1 optical fiber passes through a slotted hole in the central baffle plate of the lower shell to be provided with a sensitization sheet, and the corresponding grating is adhered to the sensitization sheet, so that the grating is ensured to be in the middle of the longitudinal concave surface of the sensitization sheet; smooth carding of the two ends of the No. 1 fiber grating;
s2.3 Assembly of lower housing and connection cover
The free ends of the two ends of the No. 1 fiber bragg grating penetrate through the two openings of the connecting cover and are smoothly carded;
placing the lower shell into a shell fixing frame so that the end face of the lower shell is horizontally upwards; the two free ends of the connecting cover and the No. 1 optical fiber are placed beside the fixing frame, so that the optical fiber is not damaged by bending; then injecting heat conduction silicone oil into the lower shell until the height of the shell reaches 80%, and ensuring that the heat conduction silicone oil accounts for 2/3 to 4/5 of the total volume of the lower shell; then the connecting cover is buckled on the lower shell, and the two free ends of the No. 1 optical fiber in the lower shell are ensured to be still kept freely stretched after the connecting cover is buckled; after confirming that the optical fiber is freely stretched, bonding and sealing the first through hole penetrating out of the optical fiber and the connecting part of the connecting cover and the lower shell by using a heat-conducting adhesive, and waiting for solidification;
and (3) negative pressure packaging: in the curing process, air in the connecting cover and the lower shell is extracted outwards from any one of the first through holes of the connecting cover by using an injector, so that a certain negative pressure is formed in the lower shell and used for checking the sealing effect of the buckling gap, and the gap which is not completely sealed or any one of the first through holes is filled by using a heat-conducting adhesive in a supplementing manner, so that the gap at the connecting position of the connecting cover and the lower shell is sealed reliably until the gap is completely cured;
S2.4, no. 2 fiber bragg grating fixation
Pasting the grating part of the No. 2 optical fiber on the outer side of the shell at the center of the lower part of the lower shell along the long axis direction of the ellipsoidal shell, and respectively bonding and sealing the optical fibers on the two sides of the corresponding grating with the contact part of the shell along the outer side wall of the ellipsoidal composite sensor along the long axis direction by using a heat-conducting adhesive to wait for solidification;
s2.5 split charging of the upper shell
Cleaning the through hole of the upper shell, covering the through hole by using a first heat conduction membrane, bonding and sealing the contact part of the first heat conduction membrane and the shell by using an adhesive, and waiting for solidification; after bonding and curing, pasting a fiber bragg grating of a No. 3 fiber in the middle part of the inner part of the first heat-conducting membrane along the long axis direction of the composite sensor shell, and pasting a fiber bragg grating of a No. 4 fiber outside the first heat-conducting membrane corresponding to the fiber bragg grating, so that the positions and the placing directions of the fiber bragg gratings of the No. 3 fiber and the No. 4 fiber are consistent; the No. 3 optical fiber and the No. 4 optical fiber are respectively bonded and sealed with the contact part of the shell along the inner side wall or the outer side wall of the upper shell by using a heat-conducting adhesive, and the curing is waited;
s2.6, manufacturing a heat conduction cavity: turning the upper shell, filling the plasticine into the upper shell, and scraping to make the plasticine fully fill the inner cavity of the upper shell; after the shell filled with the plasticine is turned over, the plasticine is reversely buckled on a flat plate, the first heat conduction membrane is downwards touched by fingers, and when the edge of the through hole of the shell is just torn and deformed, the pressing is stopped; removing the upper shell from the plasticine, leaving the plasticine on a flat plate, measuring the depth of the first heat-conducting membrane pressed down, enabling a blade to be parallel to a concave part cut off by the flat plate, coloring the periphery of an oval shape of the part left by cutting off, sleeving the part into the upper shell, marking a dyeing part on the inner shell of the upper shell, shearing a second heat-conducting membrane according to the maximum cross-sectional shape of the lower part of the dyeing region, bonding and sealing the contact part of the second heat-conducting membrane and the dyeing region of the lower part of the upper shell by using a heat-conducting adhesive, and waiting for solidification; after solidification, a heat conduction cavity is formed between the first heat conduction membrane and the second heat conduction membrane, heat conduction silicone oil is added into the heat conduction cavity, and gas in the heat conduction cavity is pumped out, so that the heat conduction silicone oil is filled between the first heat conduction membrane and the second heat conduction membrane;
S2.7 manufacturing of air bag and coiling and fixing of optical fiber in shell
According to the height of the rubber mud base, an air bag with heat conducting gas inside is manufactured, and the maximum diameter of the air bag is not larger than the height of the rubber mud base;
the air bag is adhered to the middle of the cover plate of the connecting cover by using a heat-conducting adhesive, and is fixed, so that the air bag is prevented from flying;
the No. 1 optical fiber extends out of the extension section of the first through hole of the connecting cover, bypasses the top end of the air bag from one of the first through holes according to the requirement of the minimum bending diameter, naturally penetrates out through an opening of the skirt edge of the connecting cover beside the other first through hole, and is intersected with the No. 2 optical fiber extension section;
symmetrically, the other end of the No. 1 optical fiber extends out of the extension section of the first through hole of the connecting cover, bypasses the top end of the air bag from the other first through hole according to the requirement of the minimum bending diameter, naturally penetrates out through an opening of the skirt edge of the connecting cover opposite to the first through hole, and is intersected with the extension section of the other side of the No. 2 optical fiber;
after passing through the two first through holes at the end part of the connecting cover, the No. 1 optical fiber and the No. 2 optical fiber respectively correspond to the two ends of the long axis of the composite sensor and finally are intersected; the contact part of the optical fiber and the air bag or the connecting cover is bonded and fixed by a heat-conducting adhesive to wait for solidification;
The remaining two sections of the optical fiber No. 3 which are not fixed are respectively penetrated out from the second adjacent through holes after surrounding the inside of the upper shell for a circle, so that the bending radius is prevented from being too small, and the contact part with the inside of the upper shell is bonded and fixed by a heat conducting adhesive; combining the remaining two sections of unfixed optical fibers of the No. 4 optical fiber with the inlet and outlet ends of the No. 3 optical fiber at the second through hole of the upper shell;
fixing the lower shell, the connecting cover and the air bag of the coiled and fixed optical fiber on the mounting bracket, and mutually buckling the upper shell and the connecting cover of the coiled and fixed optical fiber to ensure that the second through holes of the upper shell correspond to the openings of the skirt edges of the connecting cover, and ensuring that the No. 1 optical fiber and the No. 3 optical fiber entering and exiting the two second through holes are not sheared; the heat-conducting adhesive is filled in the buckled contact position of the upper shell and the connecting cover for bonding, sealing and fixing;
s2.8, optical cable manufacture
The fiber gratings of the No. 5 optical fiber and the No. 6 optical fiber are respectively fixed in the center of the outer side wall of the skirt edge of the oval connecting cover in the short axis direction by using a heat conducting adhesive, so that the gratings are symmetrically arranged about the longitudinal axis of the skirt edge of the oval connecting cover; then, the optical fibers at the two ends of each grating are placed at a position close to the second through hole along the outer side wall of the connecting cover and fixed by using glue; the movable parts at the two ends of the No. 5 optical fiber and the No. 6 optical fiber are respectively intersected with the intersection end of the corresponding side of the No. 1 optical fiber and the No. 2 optical fiber and the intersection section of the corresponding side of the No. 3 optical fiber and the No. 4 optical fiber at the opening of the connecting cover, and the two ends after intersection are respectively intersected with the traction rope as a cable core in sequence and are stuck together to prepare for forming an optical cable;
After numbering and confirming the optical fibers arranged around the traction rope, arranging a reinforcing piece at the center of a wire harness formed by taking the traction rope as 6 optical fibers; hooking the reinforcement into the opening of the connecting cover, and bonding and fixing the reinforcement by using a heat-conducting adhesive; according to the method for manufacturing the optical cable, a protective sleeve is manufactured outside 6 optical fibers, so that two bundles of optical cables are manufactured at two ends of the composite sensor;
s2.9, injecting foaming glue into the space among the upper shell, the air bag and the connecting cover for solidification through a guide pipe at the openings of the upper shell and the connecting cover, so as to fix the air bag, the optical fiber and the sealing effect;
the composite sensor and the optical cable are packaged, sealed and compositely reinforced by using the film, so that the temperature measuring metal wire is arranged in an outward extending way after passing through the composite sensor and the film; meanwhile, the positioning piece at the outer end of the shell or the connecting cover penetrates through the composite sensor and the film and then extends outwards;
s3: split charging of pipe joints
S3.1, selecting a pipe joint with specification matched with a hydraulic system
According to the hydraulic pipe diameter and the connection mode of a hydraulic system to be connected, a four-way pipe joint matched with a pipeline of the hydraulic system is selected, wherein the four-way pipe joint comprises a first joint and a second joint for fixing the composite sensor and an optical cable, and a third joint and a fourth joint for transmitting pipeline liquid;
S3.2, determination and identification of the orientation of the sealing plug and the third and fourth joints
Abutting the sealing plug with the corresponding part of the positioning piece at the outer end of the composite sensor, fitting the mounting cavities in the first joint and the second joint of the four-way pipe joint, ensuring that the No. 5 fiber bragg grating and the No. 6 fiber bragg grating respectively correspond to the centers of the through-flow apertures of the third joint or the fourth joint, and then marking the positions of the sealing plug relative to the positions of the first joint and the second joint by the No. 5 fiber bragg grating and the No. 6 fiber bragg grating; the position of the 3 rd fiber grating and the 4 th fiber grating, which is vertical to the central connecting line of the through-flow aperture of the third joint or the fourth joint, is symmetrical to the 2 nd fiber grating about the elliptical shell, is marked as the upward position of the pipe joint, and the 2 nd fiber grating is correspondingly positioned below the arrow and is marked by the corresponding arrow;
s4: assembly
S4.1, loading the marked sealing plug and the composite sensor into a first joint and a second joint of the four-way pipe joint according to the marking position, leading out optical cables at two ends, sequentially adding an adjusting gasket, a supporting gasket and a backstop gasket at two ends, and ensuring that inner clamping claws of the backstop gasket are placed into grooves in the first joint/the second joint;
S4.2, fixedly connecting a compression cover plate with one end face of a nut, connecting the other end face of the nut with the outer end of a first joint or a second joint of the four-way pipe joint in a threaded manner, and driving the compression cover plate on the nut to fix the composite sensor at a specified position through a supporting gasket, an adjusting gasket and a sealing plug by screwing the nut at the outer end of the first joint or the second joint;
s4.3, fixing the nut by using an outer locking plate of the backstop gasket to prevent loosening;
and installing optical fiber connectors at the outer end of the optical cable according to the marks, fixing six optical fiber positions in each connector according to the numbers, respectively corresponding to the No. 1-6 optical fibers, and ensuring that the No. 5 optical fiber grating and the No. 6 optical fiber grating respectively correspond to the positions of the third connector and the fourth connector.
2. The method for manufacturing and packaging a sensor assembly for fluid multiparameter measurement according to claim 1, wherein the lower and upper shells are made of Al-Cu based high strength casting alloy, respectively, and are semi-ellipsoidal, at least two baffles are cast in the shells, the baffles are parallel or perpendicular to the longitudinal axis of the ellipsoidal composite sensor, and a diversion hole is formed in the baffle of the lower shell for silicone oil to flow; the middle part of the baffle plate adjacent to the middle part of the shell is provided with a slotted hole correspondingly for placing the sensitization piece; protruding parts are cast at two ends of the outer parts of the upper shell and the lower shell and are arranged as positioning pieces, and temperature measuring metal wires which are used together with the inner part and the outer part of the shell are cast on the side wall of the lower shell.
3. The method of manufacturing and packaging a sensor assembly for multi-parameter measurement of fluids according to claim 2, wherein a bypass check is added after the composite sensor is mounted to the four-way pipe joint, and a sufficient space is left between the composite sensor and the two sealing plugs by visual inspection before the sealing plugs are mounted, so that the hydraulic diameter passing through the upper and lower sides of the position of the composite sensor is not less than 1/2 of the hydraulic diameter of the inlet and outlet of the pipe joint, or compressed air is introduced from the third joint and the fourth joint, and the pressure drop is measured by checking the pressure drop and judging that the pressure drop is not more than 0.1 bar.
4. A method of manufacturing and packaging a sensor assembly for fluid multiparameter measurements according to claim 2, wherein the positioning members are formed by casting protruding portions, which may be conical or cylindrical, at both outer ends of the upper and lower housing, at least two protruding portions being necessary at one end of each half housing, and a gap being ensured between the protruding portions.
5. The method of manufacturing and packaging a sensor assembly for fluid multiparameter measurement according to claim 4, wherein the thermally conductive cavity is filled with thermally conductive silicone oil to ensure that the ambient temperatures of the No. 3 and No. 4 gratings are approximately uniform.
6. The method for manufacturing and packaging a sensor assembly for fluid multiparameter measurement according to claim 5, wherein the first and second heat conducting diaphragms are made of heat conducting silica gel sheets, and the temperature resistance range is-50-220 ℃; the air bag also adopts a heat-conducting silica gel sheet, which is beneficial to the heat balance in the shell, thereby ensuring the measurement precision; the first heat conduction membrane is a high heat conduction graphene membrane, a heat conduction silica gel membrane or a heat conduction metal membrane, so as to adapt to different pressure application occasions.
7. The method of manufacturing and packaging a sensor assembly for fluid multiparameter measurement of claim 6, wherein the thermally conductive adhesive is an RTV silicone elastomer with a temperature resistance in the range of-55 ℃ to 300 ℃; the tensile strength is not less than 10MPa.
8. The method for manufacturing and packaging a sensor assembly for fluid multiparameter measurement according to claim 7, wherein step S3.2 is capable of marking the flow direction for the subsequent use of the composite sensor, wherein the weight of the upper half of the composite sensor is smaller than that of the lower half, the upper half is installed upwards, fatigue damage of additional torque to the sealing plug is avoided, and heat-conducting silicone oil in the lower housing is also placed in the airtight housing, so that leakage risk is reduced, and the temperature in the heat-conducting silicone oil is in the same temperature field as that of the grating temperature pressure sensor of the composite sensor.
9. The method for manufacturing and packaging the sensor assembly for the fluid multiparameter measurement according to claim 8, wherein the foaming glue is filled in the step S2.9, so that the fixation of the grating in the sensor assembly is ensured, the self weight of the heat-conducting silicone oil in the heat-conducting cavity is supported, and the needle hole after the syringe needle is pulled out is sealed.
10. The method for manufacturing and packaging a sensor assembly for fluid multiparameter measurement according to claim 9, wherein the connecting cover is made of Ti-6Al-4V alloy for casting, and the temperature measuring wire is made of metal or alloy with excellent heat conductivity and good toughness; the sensitization piece is made of metal or alloy with excellent heat conduction.
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| NO20021257D0 (en) * | 2002-03-13 | 2002-03-13 | Forsvarets Forsknings | Fiber optic sensor package |
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| AU2008320812A1 (en) * | 2007-10-31 | 2009-05-07 | Shell Internationale Research Maatschappij B.V. | Pressure sensor assembly and method of using the assembly |
| WO2011038536A1 (en) * | 2009-09-30 | 2011-04-07 | 江苏法尔胜泓昇集团有限公司 | Bridge intelligent cable system with built-in fiber grating sensor |
| WO2018064949A1 (en) * | 2016-10-09 | 2018-04-12 | 山东大学 | Composite material-encapsulated fiber grating sensor and manufacturing method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO20021257D0 (en) * | 2002-03-13 | 2002-03-13 | Forsvarets Forsknings | Fiber optic sensor package |
| EP1936332A1 (en) * | 2006-12-22 | 2008-06-25 | Nederlandse Organisatie voor Toegepast-Natuuurwetenschappelijk Onderzoek TNO | Karman vortex flowmeter assembly comprising a fiber Bragg grating sensor and method to measure a fluid flow rate |
| AU2008320812A1 (en) * | 2007-10-31 | 2009-05-07 | Shell Internationale Research Maatschappij B.V. | Pressure sensor assembly and method of using the assembly |
| WO2011038536A1 (en) * | 2009-09-30 | 2011-04-07 | 江苏法尔胜泓昇集团有限公司 | Bridge intelligent cable system with built-in fiber grating sensor |
| WO2018064949A1 (en) * | 2016-10-09 | 2018-04-12 | 山东大学 | Composite material-encapsulated fiber grating sensor and manufacturing method therefor |
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